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A World Health Organization panel has concluded that cellphones are “possibly carcinogenic,” putting the popular devices in the same category as certain dry cleaning chemicals and pesticides, as a potential threat to human health.

The finding, from the agency’s International Agency for Research on Cancer, adds to concerns among a small but growing group of experts about the health effects of low levels of radiation emitted by cellphones. The panel, which consisted of 31 scientists from 14 countries, was led by Dr. Jonathan M. Samet, a physician and epidemiologist at the University of Southern California and a member of President Obama’s National Cancer Advisory Board.

The group didn’t conduct any new research but reviewed numerous existing studies that focused on the health effects of radio frequency magnetic fields, which are emitted by cellphones. During a news conference, Dr. Samet said the panel’s decision to classify cellphones as “possibly carcinogenic” was based largely on epidemiological data showing an increased risk among heavy cellphone users of a rare type of brain tumor called a glioma.

Last year, a 13-country study called Interphone, the largest and longest study of the link between cellphone use and brain tumors, found no overall increased risk, but reported that participants with the highest level of cellphone use had a 40 percent higher risk of glioma. (Even if the elevated risk is confirmed, gliomas are relatively rare and thus individual risk remains minimal.).